All this is due to many years of work and experiumentacion, polishing modern and efficient algorithms that are able to make your music files sound alo same volume with the same volume..
We can verify this hypothesis by comparing the easiness of listening with the plane wave and the spherical wave adjusted to the same volume at the position of the subject with respect to the subject in the same place.
To avoid these jumps that force you to be adjusted each time the volume control but have a small program that solves practical reprogramming each mp3 to have the same volume level than the rest.
Until I found MP3Doctor PRO 2 that really solved the problem completely, now all my mp3 sound at the same volume after they have been normalized with MP3Doctor PRO 2.
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